types of chemical bonds and give an example of each. The three types of chemical bonds are ionic‚ covalent‚ and hydrogen. An ionic bond is formed between atoms with opposite’s electrical charges. When an atom loses electrons it has a positive charge‚ and it is called and cation. When an atom gains an electron it has a negative charge‚ and it is called an anion. An example of an ionic bond is sodium chloride or table salt. The sodium atom has one electron in its outer shell which is easily
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other metals which form passivating oxide layers‚ iron oxides occupy more volume than iron metal‚ and thus iron oxides flake off and expose fresh surfaces for corrosion. Iron forms compounds mainly in the +2 and +3 oxidation states. Traditionally‚ iron (II) compounds are called ferrous‚ and iron (III) compounds ferric. Properties: Like all metals‚ iron is a very good conductor of both heat and electricity. It is also strong‚ ductile and malleable. A common problem with iron is that in moist
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CHEM 208 Module 2: List the steps of the scientific method: Scientific Method: performing a study in organized step: (led to enunciation of Law of Conversation of Mass and Matter) 1. Performing experiments: a. An experiment is a set of steps (procedures) that are performed under controlled
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Chemistry: It is the science concerned with the atomic composition of substances‚ elements and their interactions‚ and the formation‚ decomposition and properties of molecules. -Biological chemistry or Biochemistry is the biological or physiological chemistry of living organisms and of the chemical changes occurring therein. Structure of Matter: All living and nonliving things are composed of matter. Matter; is anything that occupies space and has mass. Mass is the amount of matter in an object
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Name: __________________________________ Teacher: ________________________________ DO NOT OPEN THE EXAMINATION PAPER UNTIL YOU ARE TOLD BY THE SUPERVISOR TO BEGIN Chemistry 2202 FINAL EXAMINATION June 2010 Value: 100% General Instructions This examination consists of two parts. Both parts are contained in this booklet and further general instructions are provided on appropriate pages. Part I – Multiple Choice (40%) Select the letter of the correct response from those provided. EITHER
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hydrogen bonding occurs between the hydrogen and an oxygen atom in the same molecule. an oxygen atom in a different molecule. a hydrogen atom in a different molecule. a hydrogen atom in the same molecule. 5 out of 5 Correct!! Question 9 of 20 Covalent bonds form when one atom _________ its
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science for many other fields: • Medicine/Pharmacy: • Biochemistry: • Industrial Applications: • Reaction Mechanisms: What do "Organic Chemists" do? • Discover new reactions • Improve old reactions • Make new compounds • Isolate natural products • Study reaction mechanisms Most importantly‚ studying Organic Chemistry will teach how to think in an “analytical” manner about problems and it will teach you problem solving skills. No matter what you
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Chapter 1: Biology- The study of life A Hierarchy of Organization 1. Molecules 2. Organelle 3. Cell 4. Tissue 5. Organ 6. Organism Emergent Properties- Novel properties that emerge as each step up the hierarchy of biological order is taken. Reductionism- Reducing complex systems to simpler components that are more manageable to study. Cells- The lowest level of structure capable of performing all the activities of life‚ all organisms are composed of cells which are the basic units of structure
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Negative(b) Positive(c) Neutral(d) Depends upon the concentration of impurities (Q.5) Ferrimagnetism is shown by ( 1 mark ) (a) Nickel(b) Oxygen molecule(c) Cromium oxide (CrO2)(d) Magnetite (Q.6) What are the stoichiometric defects found in ionic crystals? ( 1 mark ) (Q.7) Write two examples of amorphous solids? ( 1 mark ) (Q.8) A solid substance XY has a rock salt geometry. What is the co-ordination number of X and Y? How many atoms of X and Y are present in the unit cell? ( 1 mark )
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Chemistry Types pf Compounds * Homogeneous mixtures are composed of one or more parts that look as one. * Heterogeneous mixtures consist of two or more substances and do not look as one. * Compounds are two or more elements that are chemically combined. * Matter that contains more than one kind of particle. * Elements are pure substances that cannot be broken down into smaller parts. * Solutions are a mixture of one or more substances and is homogeneous. * Pure substances
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